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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc15d41badcc58ce28f9a6afa65a9ff801443cd43dc504341067d6520f197af' 
  AND token = 'Pw0OqwGKFYwR4JosdugEqu5YV/pAc0uPSoWaWL6brjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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