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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4e579d7593619c08170674f38febccbe2d74814a956e99549d71e7c609c9163' 
  AND token = 'Dcr0ZiNPINiNcawo6n+F/MMd7xXKdfJYowvXH9euqik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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