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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5776b5972bd0a9d08cedcdf1ae1de5edff63f3978cfe639f33fabaef2d690f' 
  AND token = '+1cb1n2qtlYCAdPv9o64etSe7dLtv8F+0zhUemc+wCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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