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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6672c907f4b7e1ad87b418eb55eefc56c4a0ea16da2164b4fb46ed24f92bd67' 
  AND token = 'KA6oxqr4uA4O7byIWO78IKtvRKyivJU3PAdASuJZgbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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