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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0640d0e331c7f37c10d040c0919b4abed84f185394a9d3e764a00ae9c07e7e' 
  AND token = 'H8wiApYnRwO8MXmITHlHFyPUgHkJWmVm8Qbg2JSr9FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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