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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e1fe766047e55a8ab905619721322c43e885150aa5a415ae76aacccc2d3910' 
  AND token = '+PCmdZN8ziFJ8SOFQ0gC8H/roROIoCLR8HijA+Dcn68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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