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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93740f298d7b3386d7e458bac4ad51b0644c08d1aadff8de14d0c3bdd22bab38' 
  AND token = 'x7oORdVYDt6GMYHAPa0L9BuLs3h1bLKFeA62SewHfEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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