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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39893bc095da2fe6171ea2efa2f64c1d1c78ef7d16aa53f4cac5f4d9ce1ee1f6' 
  AND token = 'eOKAK7O81QzFGdaE8suQfhi7+yK0RabA0kCIGZtQaag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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