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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a0af15b8a2017f063deb9ae28d34127529e3a8fcb50e5d66330b07541d541b6' 
  AND token = 'buuxGIUBF3x1F6Es4VrSnCoESKOpxB575QgjhrK1DFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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