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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d35fec1df03fa9c4638d670d71bd51091b8fac80b73b11c10b308e0c87bcfe' 
  AND token = 'xRC0tqoZz2entrG8HEo/6caGx4qKH8XkIGklqdivlXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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