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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3dbf1b3b7cd42239a2b569f5681e36cbea9f81edac1a36cf380393e49f74810' 
  AND token = 'L5n77y1/dfvE1twMr/PSr+OVFdScA8l8zUu0FJbwQtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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