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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7513f707fe3bd273c33a2457b456fd2f9aa8c1553250ae2460d1b02efb44ee0' 
  AND token = '0dpgL92/0omS3xjUzP0WvzhpZ2alGsuTRtOmFlMSR0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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