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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d6ad5f7216a60477a5705d7f1ebd37cd87ffae8fb4be7831521340f9c31bd8' 
  AND token = 'VtNOczGlMX+RKXtsvhDH7SVpRfYjr7iyRbkzu6Rg18M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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