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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5237288d28303d4a5952725ea50c89bc96e0beebdeca8169c43ca1c23cc72b7f' 
  AND token = '46FqGVwpBdtEdi8rd6tn+wW288zF0vflfJzdh5kz98w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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