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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad87df5c1f6e2b2ec5a50fb3eb132d3f3d466b6aa66722647d9e517f95de7e58' 
  AND token = 'RPqRMSETujE9LySjEddJbibrBxPcarUgE/JP7L9qTsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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