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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e314cfa059fd250caa497239f2798b95a4986f1f3ad29f33aee70cccc24e530e' 
  AND token = 'WsV/14+xpf/PHJuladBxd+h+nkpb7QsuEU0xN4pltlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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