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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a35e95013858eddd12c04c9bd325d4c81af977094f303c27b2751f612e312a' 
  AND token = 'vzblPYe/MyNA1IO0Rm2osQaH3witlhuB3lrTVNocmm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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