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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a48943b449c11b9ce953821b1eded134aafeb86c7a31b00ad6f0b460fa0fc2c' 
  AND token = 'L3A7Hoq9AjHanrcRBVZEaofR3nwI74EFCRNap4c47i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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