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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886037381e931d2c63b20a03089b2d1f83e227d9df7aa0288d9b44e71d74fe67' 
  AND token = 'PlfWtomY0F9UeN71r4BMm823nt3vuqzKt/h38eliKH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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