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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4553516ecea1600063061a529aaf10b88684a0727190b84d5bcb782cf6c946b' 
  AND token = 'cZGLMKMKJHInBM8HC7KptBV53Z+1s4WfoX9LGfMe1eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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