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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '637e87f0867348174ffa11a28a745fb082e92663bb573b83a128bd26296e8056' 
  AND token = 'pfwabc+cOWrFvtLUsZsbNLgdj5A8zr8V0HwMfSPZP8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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