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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23cd1422117b7541079530dd7652b583d50599b210f22b602b14a9ffa59650df' 
  AND token = 'p1GhGnhojnWrb9Ji0ybQec+jryGrjcCb9KUWLZC+Ito=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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