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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d4106a9812f4be3ed04df4e81af166a2cf8fe8a802a0ee3c676be0db56ee7f1' 
  AND token = 'aGBEAsbzlGC5GObtRCwMtxU09V86tv7aGzYDmddPE78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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