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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b1e05a9005165d98ac9c7642fbe0632d95b53a4f7e3ab13dc8745c63c0dff31' 
  AND token = 'x/k/NCq8QG02kv/pRh1d9BvhYSU0+/iAIX1+Ye3qsI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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