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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c80574f14c682c2ce51e26e6ce92536953848c7531e078484ffcc98dbd23df3' 
  AND token = 'B4SANkwz2lyB+1jfCU6rONAw0lKNscFpW/8saJc+CcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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