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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe3979ce5fbfbdd48c77882f0911e1f693f348325a6b0f685f767c48575767a' 
  AND token = '+z/E1zCtf7jWQ5SlpSmUz1WlYtGE0wfEA1ZJV9Z6iMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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