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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbcdac458bcfc2b72a6d69233fd5c40c57db5d38b2a151cd9684cc24346606e0' 
  AND token = 'lrI6CyclPs0jdKOQNv+RJHG6iwm1Du2dwoc1Tj1TOX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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