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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42958653e795def863c6de62388ca465b497768b8638dcadb8d86a79077e8ffc' 
  AND token = '5VMseAusxYCmNjBUz4nmNaoc6dgFvBuymkbc8Z8sP10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}