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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ccefb90e46c5385d1ed2c3c152deb0dd7582da5a446e0c4a2a4250cf71aa18' 
  AND token = 'ZGY5zhQh8pCDFREaNjyd6x2wotBaje2kYxKcHBLSBLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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