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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24fd3b895649b701d50f94192fe47df3b87d1c3f738f714c8d8407ccdaa7527c' 
  AND token = 'hBNEChy0R5vMLTSNVUC11buiaSMkBp33gOuJ6fUa77U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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