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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b22e5f963b7ba93ea3eda4ab1c7a6bd8bf810030491a5cb0545bf447c57393ff' 
  AND token = 'ej3GMyZSVlHmOjhbG02BEIVRAiNuBntqdnUSuXykxOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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