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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2f60ab3ec0a1c5cd93365f8699875587318008f5e788465991a953b1416c11' 
  AND token = 'uSzz3Uwf88jiwoXI67EJG7gybm2JSA3MyWIdKCmUhK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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