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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d61c583b69d3886dab56e720d3dfe24e9e0c3061b01751be31aa06812caee9a' 
  AND token = '8eOn6/9j4zcW2rF+ZA1CRntTvxpdyZFB/LH9PaPx9QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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