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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bd7959e64a24b85fd467886df6cb10638edcb3d22091d6e554c1e1e69662360' 
  AND token = 'CuYZlmVfIw5Kmg+p0A0lMYYwDn3B3NUPR32MdPdS+Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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