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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d50fc9d6a28fbc9c6c2c1fa1ad20dccd3ef31f6a55ae754e7374f41e93442e' 
  AND token = 'AMon+YPbA6ttIvYo0irKzYB6L7T7EX+6KuZefsSm4vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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