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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75b937c9d5b1b7dd2ad0abc6f79f8daedfa403876851ec9bbc3a9fa900bdecd5' 
  AND token = 'OrQuMFJxQkPD2Tmr1/xYETvoMRm4bAMJLiGKNEmQcR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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