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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1724efbd28dc0b86307554d3968ab302a3734dc44d7f9eb1dcae17e87fe430c8' 
  AND token = '71e+kjuk9HCyQnPALbI0AOFBMaI+aeMtH/Tk/6X0Bbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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