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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea0e5cbc7259c993c8e169d390bb8d28f299c7fe8bc57f3f73735668dfa6d93f' 
  AND token = 'M8Uv4Y7LE81mT5PnS5c0809Cl1WEpEJyj8ERltlKlIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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