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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa8e898feff54968577e809c5d79cd124c331b68ea7f29f2f1b125d918368fba' 
  AND token = 'wdkFN8kP1QfH5bT4ta7u2u7dKgo6pUPdYbwXHEuNFYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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