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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e810161d6ad85b36fbd7310823a4c3ad9f959dea2f395b7ef069bd8ff03051e2' 
  AND token = 'TLKHalPqaAjC9m0EJp04ZuepntDDZdBfh8IIFYnOXE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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