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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '778d9c5504fe22844629a840ade3a9e93bf5db0fbdb806bc4771da966d6a1b52' 
  AND token = 'r87ESEDKaApzSm4LUW/ps2ZDselL3Ct18LbcA2VUfJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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