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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91d3437f00a0502d3c1bfb4c70e2992cf0686b3b0be41ab487ff753cc01d22d' 
  AND token = 'gVSH09I3kbI38Ny3SmYbL0GDIyrSht2jS2BDHc7pUOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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