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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b9730e319b02dccc131b06b2b944d48ea4686def66f75134f759ddfeebd82f6' 
  AND token = '/G2eWe+JSVEAEF7li/vdXfJ7k4Yhu8nETeXNGjXhFYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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