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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9550dd2eeb8109ecfec324e4ce96b6f8d9665a84ed402ad62aa3582c7e600b10' 
  AND token = 'p7b0a7Ro/ZYENKzIbCl0xLn3fuGlvE9FiBW/v9BcHrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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