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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a4602e4b1645e36dfa37efdfb288030b2b0c189d6d2ae0a18ce6dc51af615d' 
  AND token = 'ZuP64PyvWknlppKlzPNuQU7S/3ev0PvK1f2nPD4joyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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