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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '589215e7d81af2c113ab9f5824f635263f6cc79ce39451cedd234108128dffc0' 
  AND token = '+0EwDGhL44a05AsJvw6jrVQv5x3VqmZyt5TkvfwPeWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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