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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b866d2506c0cacf13bd9eba8be3bd9aa034f0cd433be1aa2ddf7007dba70eb6' 
  AND token = 'ufz1gGP12Y3hp7tX6NjExgvrNqv0qFkbKcS0u440va4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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