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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '932b4ee86912b57583f238502e33101fac47f507b91dcb3d7aa0bcb40abebd66' 
  AND token = 'MRL6exnW9muzqzRJ8bbc8c3pKkKoUpddjR4suGD4Q1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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