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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae3f2e093fecc1e5e7bfc1491620241d954d183c298bca149c6f786763534778' 
  AND token = 'Ucx+2gkRd6D1NiUlCxpu+Qwu0WNtc/dM5TMILPI6Lu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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