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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de68eb91708c922ee8af156deaa6058edc442ed0d5ee47d86a3145f9a78457c' 
  AND token = 'zIHKBgJt8FuLMoB8yN+6Ycl11ECTCQ8J+ZwQqAu48dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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