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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57c88e2f78eb287ad2d7a35a22a41e5690212f78e853d735adcb537bb55e7a83' 
  AND token = 'ABbSG6TMBNv/v/Lk0vg1e6EZQEOWscY5GVsYceeE0GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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