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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed4386dc82d9a6a4d336695e1eb68d1a2c0f1fd02712b6046bd1b2ae60bd8f6a' 
  AND token = '4k30MBNKPLU3xTovVx7/KfHZfFjeXTwGrVIvvJr5g5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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