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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dadb89035c04aba0ef3e785bc2333d0e7cc92e5afd1510e45f0cda484bf708f' 
  AND token = '+bmcrZ4oONBVBO8XWeJEa5qhmG/6CbVlhJLW5Ff2/kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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