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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4fe0d6ff889cfbf84dc4938f1028cb6622dfd08d84354e9d9e907e7861f5f26' 
  AND token = 'vhdBUWvI6Y86uAlZgBAJrOxUNKz4hF9x7YJJvY29CNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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