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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8fe76c80ab961ab34882dd67817af51e1c1b3f4d5df8bef31af3c4b49074c0' 
  AND token = 'AMwRsnrN+4rijzA5FXQ8OjImq1MGHZjFxN90DZcMGO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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