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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c008e305062e4f2cdc62eefa15bcde46ab274850a86163b9a14c6eeed92f70' 
  AND token = 'IqBYdrkUht9lgMx0tixY1KN4y2KBtDvHYt+sBbuXSjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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