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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae24de0799495f1334d25745892667fc87f79c1ba7d218d24d619f4fbaaa9b5' 
  AND token = 'WSa6Rj2x7lieeM/odoDo/glOcty5MnUXIu+RFL6TxDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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