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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24adeba8d71b53c380edf14fc3e56581e8d5cc2c111bd00e1efc0609c662c856' 
  AND token = 'eyBr05M54s+Yr5rscHbVy6zdHtW4EHRY0TfYt0eTjUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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