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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6409d9152faea7947ffbba0a2c402942f47b6becf8128f56f1f76d62d716b1' 
  AND token = 'N7sBoqfXTW6c1BPMO3mCr+x7hCOzxKaVT7n2XcwTHuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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