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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c491a824e5fe85b7a88b4a1c97783bafc25cb7fe6bf0c65c3ebaf20b92b2092b' 
  AND token = 'uFBKFjX5h0+0O9U4zZz4UR+Zn6sush8gsv1a269ssDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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